package com.zhangshitong.util;

import org.apache.commons.lang3.StringUtils;

public class LevelUtil {

	 	public final static String SEPARATOR = ".";

	    public final static String ROOT = "0";

	    // 0
	    // 0.1
	    // 0.1.2
	    // 0.1.3
	    // 0.4
	    public static String calculateLevel(String parentLevel, int parentId) {
	        if (StringUtils.isBlank(parentLevel)) {
	            return ROOT;
	        } else {
	            return StringUtils.join(parentLevel, SEPARATOR, parentId);
	        }
	    }
}
